/**
 * Copyright 2009 Sergio Bossa
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package com.googlecode.actorom.impl.core.reactor;

import java.util.LinkedList;
import java.util.Queue;
import net.jcip.annotations.ThreadSafe;

/**
 * @author Sergio Bossa
 */
@ThreadSafe
public class MessageQueue {

    private final Queue<MessageHandle> handles = new LinkedList<MessageHandle>();
    private boolean interrupted = false;

    public void put(MessageHandle handle) throws InterruptedException {
        synchronized (handles) {
            handles.offer(handle);
            handles.notifyAll();
        }
    }

    public void read(Queue<MessageHandle> destination) throws InterruptedException {
        synchronized (handles) {
            while (handles.isEmpty() && !interrupted) {
                handles.wait();
            }
            if (!interrupted) {
                while (!handles.isEmpty()) {
                    destination.offer(handles.remove());
                }
            } else {
                interrupted = false;
            }
        }
    }

    public void interrupt() {
        synchronized (handles) {
            interrupted = true;
            handles.notifyAll();
        }
    }
}